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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2007 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.io;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import com.google.common.annotations.Beta;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import com.google.common.base.Preconditions;<a name="line.20"></a>
<span class="sourceLineNo">021</span><a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.io.FilterInputStream;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.io.IOException;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.io.InputStream;<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span>/**<a name="line.26"></a>
<span class="sourceLineNo">027</span> * An InputStream that limits the number of bytes which can be read.<a name="line.27"></a>
<span class="sourceLineNo">028</span> *<a name="line.28"></a>
<span class="sourceLineNo">029</span> * @author Charles Fry<a name="line.29"></a>
<span class="sourceLineNo">030</span> * @since 1.0<a name="line.30"></a>
<span class="sourceLineNo">031</span> * @deprecated Use {@link ByteStreams#limit} instead. This class is scheduled<a name="line.31"></a>
<span class="sourceLineNo">032</span> *     to be removed in Guava release 15.0.<a name="line.32"></a>
<span class="sourceLineNo">033</span> */<a name="line.33"></a>
<span class="sourceLineNo">034</span>@Beta<a name="line.34"></a>
<span class="sourceLineNo">035</span>@Deprecated<a name="line.35"></a>
<span class="sourceLineNo">036</span>public final class LimitInputStream extends FilterInputStream {<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span>  private long left;<a name="line.38"></a>
<span class="sourceLineNo">039</span>  private long mark = -1;<a name="line.39"></a>
<span class="sourceLineNo">040</span><a name="line.40"></a>
<span class="sourceLineNo">041</span>  /**<a name="line.41"></a>
<span class="sourceLineNo">042</span>   * Wraps another input stream, limiting the number of bytes which can be read.<a name="line.42"></a>
<span class="sourceLineNo">043</span>   *<a name="line.43"></a>
<span class="sourceLineNo">044</span>   * @param in the input stream to be wrapped<a name="line.44"></a>
<span class="sourceLineNo">045</span>   * @param limit the maximum number of bytes to be read<a name="line.45"></a>
<span class="sourceLineNo">046</span>   */<a name="line.46"></a>
<span class="sourceLineNo">047</span>  public LimitInputStream(InputStream in, long limit) {<a name="line.47"></a>
<span class="sourceLineNo">048</span>    super(in);<a name="line.48"></a>
<span class="sourceLineNo">049</span>    Preconditions.checkNotNull(in);<a name="line.49"></a>
<span class="sourceLineNo">050</span>    Preconditions.checkArgument(limit &gt;= 0, "limit must be non-negative");<a name="line.50"></a>
<span class="sourceLineNo">051</span>    left = limit;<a name="line.51"></a>
<span class="sourceLineNo">052</span>  }<a name="line.52"></a>
<span class="sourceLineNo">053</span><a name="line.53"></a>
<span class="sourceLineNo">054</span>  @Override public int available() throws IOException {<a name="line.54"></a>
<span class="sourceLineNo">055</span>    return (int) Math.min(in.available(), left);<a name="line.55"></a>
<span class="sourceLineNo">056</span>  }<a name="line.56"></a>
<span class="sourceLineNo">057</span><a name="line.57"></a>
<span class="sourceLineNo">058</span>  @Override public synchronized void mark(int readlimit) {<a name="line.58"></a>
<span class="sourceLineNo">059</span>    in.mark(readlimit);<a name="line.59"></a>
<span class="sourceLineNo">060</span>    mark = left;<a name="line.60"></a>
<span class="sourceLineNo">061</span>    // it's okay to mark even if mark isn't supported, as reset won't work<a name="line.61"></a>
<span class="sourceLineNo">062</span>  }<a name="line.62"></a>
<span class="sourceLineNo">063</span><a name="line.63"></a>
<span class="sourceLineNo">064</span>  @Override public int read() throws IOException {<a name="line.64"></a>
<span class="sourceLineNo">065</span>    if (left == 0) {<a name="line.65"></a>
<span class="sourceLineNo">066</span>      return -1;<a name="line.66"></a>
<span class="sourceLineNo">067</span>    }<a name="line.67"></a>
<span class="sourceLineNo">068</span><a name="line.68"></a>
<span class="sourceLineNo">069</span>    int result = in.read();<a name="line.69"></a>
<span class="sourceLineNo">070</span>    if (result != -1) {<a name="line.70"></a>
<span class="sourceLineNo">071</span>      --left;<a name="line.71"></a>
<span class="sourceLineNo">072</span>    }<a name="line.72"></a>
<span class="sourceLineNo">073</span>    return result;<a name="line.73"></a>
<span class="sourceLineNo">074</span>  }<a name="line.74"></a>
<span class="sourceLineNo">075</span><a name="line.75"></a>
<span class="sourceLineNo">076</span>  @Override public int read(byte[] b, int off, int len) throws IOException {<a name="line.76"></a>
<span class="sourceLineNo">077</span>    if (left == 0) {<a name="line.77"></a>
<span class="sourceLineNo">078</span>      return -1;<a name="line.78"></a>
<span class="sourceLineNo">079</span>    }<a name="line.79"></a>
<span class="sourceLineNo">080</span><a name="line.80"></a>
<span class="sourceLineNo">081</span>    len = (int) Math.min(len, left);<a name="line.81"></a>
<span class="sourceLineNo">082</span>    int result = in.read(b, off, len);<a name="line.82"></a>
<span class="sourceLineNo">083</span>    if (result != -1) {<a name="line.83"></a>
<span class="sourceLineNo">084</span>      left -= result;<a name="line.84"></a>
<span class="sourceLineNo">085</span>    }<a name="line.85"></a>
<span class="sourceLineNo">086</span>    return result;<a name="line.86"></a>
<span class="sourceLineNo">087</span>  }<a name="line.87"></a>
<span class="sourceLineNo">088</span><a name="line.88"></a>
<span class="sourceLineNo">089</span>  @Override public synchronized void reset() throws IOException {<a name="line.89"></a>
<span class="sourceLineNo">090</span>    if (!in.markSupported()) {<a name="line.90"></a>
<span class="sourceLineNo">091</span>      throw new IOException("Mark not supported");<a name="line.91"></a>
<span class="sourceLineNo">092</span>    }<a name="line.92"></a>
<span class="sourceLineNo">093</span>    if (mark == -1) {<a name="line.93"></a>
<span class="sourceLineNo">094</span>      throw new IOException("Mark not set");<a name="line.94"></a>
<span class="sourceLineNo">095</span>    }<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span>    in.reset();<a name="line.97"></a>
<span class="sourceLineNo">098</span>    left = mark;<a name="line.98"></a>
<span class="sourceLineNo">099</span>  }<a name="line.99"></a>
<span class="sourceLineNo">100</span><a name="line.100"></a>
<span class="sourceLineNo">101</span>  @Override public long skip(long n) throws IOException {<a name="line.101"></a>
<span class="sourceLineNo">102</span>    n = Math.min(n, left);<a name="line.102"></a>
<span class="sourceLineNo">103</span>    long skipped = in.skip(n);<a name="line.103"></a>
<span class="sourceLineNo">104</span>    left -= skipped;<a name="line.104"></a>
<span class="sourceLineNo">105</span>    return skipped;<a name="line.105"></a>
<span class="sourceLineNo">106</span>  }<a name="line.106"></a>
<span class="sourceLineNo">107</span>}<a name="line.107"></a>




























































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